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micropython/py/emitbc.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "py/mpstate.h"
#include "py/smallint.h"
#include "py/emit.h"
#include "py/bc0.h"
#if MICROPY_ENABLE_COMPILER
#define DUMMY_DATA_SIZE (MP_ENCODE_UINT_MAX_BYTES)
struct _emit_t {
// Accessed as mp_obj_t, so must be aligned as such, and we rely on the
// memory allocator returning a suitably aligned pointer.
// Should work for cases when mp_obj_t is 64-bit on a 32-bit machine.
byte dummy_data[DUMMY_DATA_SIZE];
pass_kind_t pass : 8;
// Set to true if the code generator should suppress emitted code due to it
// being dead code. This can happen when opcodes immediately follow an
// unconditional flow control (eg jump or raise).
bool suppress;
int stack_size;
mp_emit_common_t *emit_common;
scope_t *scope;
mp_uint_t last_source_line_offset;
mp_uint_t last_source_line;
size_t max_num_labels;
size_t *label_offsets;
size_t code_info_offset;
size_t code_info_size;
size_t bytecode_offset;
size_t bytecode_size;
byte *code_base; // stores both byte code and code info
bool overflow;
size_t n_info;
size_t n_cell;
};
emit_t *emit_bc_new(mp_emit_common_t *emit_common) {
emit_t *emit = m_new0(emit_t, 1);
emit->emit_common = emit_common;
return emit;
}
void emit_bc_set_max_num_labels(emit_t *emit, mp_uint_t max_num_labels) {
emit->max_num_labels = max_num_labels;
emit->label_offsets = m_new(size_t, emit->max_num_labels);
}
void emit_bc_free(emit_t *emit) {
m_del(size_t, emit->label_offsets, emit->max_num_labels);
m_del_obj(emit_t, emit);
}
// all functions must go through this one to emit code info
STATIC uint8_t *emit_get_cur_to_write_code_info(void *emit_in, size_t num_bytes_to_write) {
emit_t *emit = emit_in;
if (emit->pass < MP_PASS_EMIT) {
emit->code_info_offset += num_bytes_to_write;
return emit->dummy_data;
} else {
assert(emit->code_info_offset + num_bytes_to_write <= emit->code_info_size);
byte *c = emit->code_base + emit->code_info_offset;
emit->code_info_offset += num_bytes_to_write;
return c;
}
}
STATIC void emit_write_code_info_byte(emit_t *emit, byte val) {
*emit_get_cur_to_write_code_info(emit, 1) = val;
}
STATIC void emit_write_code_info_qstr(emit_t *emit, qstr qst) {
mp_encode_uint(emit, emit_get_cur_to_write_code_info, mp_emit_common_use_qstr(emit->emit_common, qst));
}
#if MICROPY_ENABLE_SOURCE_LINE
STATIC void emit_write_code_info_bytes_lines(emit_t *emit, mp_uint_t bytes_to_skip, mp_uint_t lines_to_skip) {
assert(bytes_to_skip > 0 || lines_to_skip > 0);
while (bytes_to_skip > 0 || lines_to_skip > 0) {
mp_uint_t b, l;
if (lines_to_skip <= 6 || bytes_to_skip > 0xf) {
// use 0b0LLBBBBB encoding
b = MIN(bytes_to_skip, 0x1f);
if (b < bytes_to_skip) {
// we can't skip any lines until we skip all the bytes
l = 0;
} else {
l = MIN(lines_to_skip, 0x3);
}
*emit_get_cur_to_write_code_info(emit, 1) = b | (l << 5);
} else {
// use 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
b = MIN(bytes_to_skip, 0xf);
l = MIN(lines_to_skip, 0x7ff);
byte *ci = emit_get_cur_to_write_code_info(emit, 2);
ci[0] = 0x80 | b | ((l >> 4) & 0x70);
ci[1] = l;
}
bytes_to_skip -= b;
lines_to_skip -= l;
}
}
#endif
// all functions must go through this one to emit byte code
STATIC uint8_t *emit_get_cur_to_write_bytecode(void *emit_in, size_t num_bytes_to_write) {
emit_t *emit = emit_in;
if (emit->suppress) {
return emit->dummy_data;
}
if (emit->pass < MP_PASS_EMIT) {
emit->bytecode_offset += num_bytes_to_write;
return emit->dummy_data;
} else {
assert(emit->bytecode_offset + num_bytes_to_write <= emit->bytecode_size);
byte *c = emit->code_base + emit->code_info_size + emit->bytecode_offset;
emit->bytecode_offset += num_bytes_to_write;
return c;
}
}
STATIC void emit_write_bytecode_raw_byte(emit_t *emit, byte b1) {
byte *c = emit_get_cur_to_write_bytecode(emit, 1);
c[0] = b1;
}
STATIC void emit_write_bytecode_byte(emit_t *emit, int stack_adj, byte b1) {
mp_emit_bc_adjust_stack_size(emit, stack_adj);
byte *c = emit_get_cur_to_write_bytecode(emit, 1);
c[0] = b1;
}
// Similar to mp_encode_uint(), just some extra handling to encode sign
STATIC void emit_write_bytecode_byte_int(emit_t *emit, int stack_adj, byte b1, mp_int_t num) {
emit_write_bytecode_byte(emit, stack_adj, b1);
// We store each 7 bits in a separate byte, and that's how many bytes needed
byte buf[MP_ENCODE_UINT_MAX_BYTES];
byte *p = buf + sizeof(buf);
// We encode in little-ending order, but store in big-endian, to help decoding
do {
*--p = num & 0x7f;
num >>= 7;
} while (num != 0 && num != -1);
// Make sure that highest bit we stored (mask 0x40) matches sign
// of the number. If not, store extra byte just to encode sign
if (num == -1 && (*p & 0x40) == 0) {
*--p = 0x7f;
} else if (num == 0 && (*p & 0x40) != 0) {
*--p = 0;
}
byte *c = emit_get_cur_to_write_bytecode(emit, buf + sizeof(buf) - p);
while (p != buf + sizeof(buf) - 1) {
*c++ = *p++ | 0x80;
}
*c = *p;
}
STATIC void emit_write_bytecode_byte_uint(emit_t *emit, int stack_adj, byte b, mp_uint_t val) {
emit_write_bytecode_byte(emit, stack_adj, b);
mp_encode_uint(emit, emit_get_cur_to_write_bytecode, val);
}
STATIC void emit_write_bytecode_byte_const(emit_t *emit, int stack_adj, byte b, mp_uint_t n) {
emit_write_bytecode_byte_uint(emit, stack_adj, b, n);
}
STATIC void emit_write_bytecode_byte_qstr(emit_t *emit, int stack_adj, byte b, qstr qst) {
emit_write_bytecode_byte_uint(emit, stack_adj, b, mp_emit_common_use_qstr(emit->emit_common, qst));
}
STATIC void emit_write_bytecode_byte_obj(emit_t *emit, int stack_adj, byte b, mp_obj_t obj) {
emit_write_bytecode_byte_const(emit, stack_adj, b, mp_emit_common_use_const_obj(emit->emit_common, obj));
}
STATIC void emit_write_bytecode_byte_child(emit_t *emit, int stack_adj, byte b, mp_raw_code_t *rc) {
emit_write_bytecode_byte_const(emit, stack_adj, b,
mp_emit_common_alloc_const_child(emit->emit_common, rc));
#if MICROPY_PY_SYS_SETTRACE
rc->line_of_definition = emit->last_source_line;
#endif
}
// Emit a jump opcode to a destination label.
// The offset to the label is relative to the ip following this instruction.
// The offset is encoded as either 1 or 2 bytes, depending on how big it is.
// The encoding of this jump opcode can change size from one pass to the next,
// but it must only ever decrease in size on successive passes.
STATIC void emit_write_bytecode_byte_label(emit_t *emit, int stack_adj, byte b1, mp_uint_t label) {
mp_emit_bc_adjust_stack_size(emit, stack_adj);
if (emit->suppress) {
return;
}
// Determine if the jump offset is signed or unsigned, based on the opcode.
const bool is_signed = b1 <= MP_BC_POP_JUMP_IF_FALSE;
// Default to a 2-byte encoding (the largest) with an unknown jump offset.
unsigned int jump_encoding_size = 1;
ssize_t bytecode_offset = 0;
// Compute the jump size and offset only when code size is known.
if (emit->pass >= MP_PASS_CODE_SIZE) {
// The -2 accounts for this jump opcode taking 2 bytes (at least).
bytecode_offset = emit->label_offsets[label] - emit->bytecode_offset - 2;
// Check if the bytecode_offset is small enough to use a 1-byte encoding.
if ((is_signed && -64 <= bytecode_offset && bytecode_offset <= 63)
|| (!is_signed && (size_t)bytecode_offset <= 127)) {
// Use a 1-byte jump offset.
jump_encoding_size = 0;
}
// Adjust the offset depending on the size of the encoding of the offset.
bytecode_offset -= jump_encoding_size;
assert(is_signed || bytecode_offset >= 0);
}
// Emit the opcode.
byte *c = emit_get_cur_to_write_bytecode(emit, 2 + jump_encoding_size);
c[0] = b1;
if (jump_encoding_size == 0) {
if (is_signed) {
bytecode_offset += 0x40;
}
assert(0 <= bytecode_offset && bytecode_offset <= 0x7f);
c[1] = bytecode_offset;
} else {
if (is_signed) {
bytecode_offset += 0x4000;
}
if (emit->pass == MP_PASS_EMIT && !(0 <= bytecode_offset && bytecode_offset <= 0x7fff)) {
emit->overflow = true;
}
c[1] = 0x80 | (bytecode_offset & 0x7f);
c[2] = bytecode_offset >> 7;
}
}
void mp_emit_bc_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
emit->pass = pass;
emit->stack_size = 0;
emit->suppress = false;
emit->scope = scope;
emit->last_source_line_offset = 0;
emit->last_source_line = 1;
emit->bytecode_offset = 0;
emit->code_info_offset = 0;
emit->overflow = false;
// Write local state size, exception stack size, scope flags and number of arguments
{
mp_uint_t n_state = scope->num_locals + scope->stack_size;
if (n_state == 0) {
// Need at least 1 entry in the state, in the case an exception is
// propagated through this function, the exception is returned in
// the highest slot in the state (fastn[0], see vm.c).
n_state = 1;
}
#if MICROPY_DEBUG_VM_STACK_OVERFLOW
// An extra slot in the stack is needed to detect VM stack overflow
n_state += 1;
#endif
size_t n_exc_stack = scope->exc_stack_size;
MP_BC_PRELUDE_SIG_ENCODE(n_state, n_exc_stack, scope, emit_write_code_info_byte, emit);
}
// Write number of cells and size of the source code info
if (emit->pass >= MP_PASS_CODE_SIZE) {
size_t n_info = emit->n_info;
size_t n_cell = emit->n_cell;
MP_BC_PRELUDE_SIZE_ENCODE(n_info, n_cell, emit_write_code_info_byte, emit);
}
emit->n_info = emit->code_info_offset;
// Write the name of this function.
emit_write_code_info_qstr(emit, scope->simple_name);
// Write argument names, needed to resolve positional args passed as keywords.
{
// For a given argument position (indexed by i) we need to find the
// corresponding id_info which is a parameter, as it has the correct
// qstr name to use as the argument name. Note that it's not a simple
// 1-1 mapping (ie i!=j in general) because of possible closed-over
// variables. In the case that the argument i has no corresponding
// parameter we use "*" as its name (since no argument can ever be named
// "*"). We could use a blank qstr but "*" is better for debugging.
// Note: there is some wasted RAM here for the case of storing a qstr
// for each closed-over variable, and maybe there is a better way to do
// it, but that would require changes to mp_setup_code_state.
for (int i = 0; i < scope->num_pos_args + scope->num_kwonly_args; i++) {
qstr qst = MP_QSTR__star_;
for (int j = 0; j < scope->id_info_len; ++j) {
id_info_t *id = &scope->id_info[j];
if ((id->flags & ID_FLAG_IS_PARAM) && id->local_num == i) {
qst = id->qst;
break;
}
}
emit_write_code_info_qstr(emit, qst);
}
}
}
bool mp_emit_bc_end_pass(emit_t *emit) {
if (emit->pass == MP_PASS_SCOPE) {
return true;
}
// check stack is back to zero size
assert(emit->stack_size == 0);
// Calculate size of source code info section
emit->n_info = emit->code_info_offset - emit->n_info;
// Emit closure section of prelude
emit->n_cell = 0;
for (size_t i = 0; i < emit->scope->id_info_len; ++i) {
id_info_t *id = &emit->scope->id_info[i];
if (id->kind == ID_INFO_KIND_CELL) {
assert(id->local_num <= 255);
emit_write_code_info_byte(emit, id->local_num); // write the local which should be converted to a cell
++emit->n_cell;
}
}
if (emit->pass == MP_PASS_CODE_SIZE) {
// calculate size of total code-info + bytecode, in bytes
emit->code_info_size = emit->code_info_offset;
emit->bytecode_size = emit->bytecode_offset;
emit->code_base = m_new0(byte, emit->code_info_size + emit->bytecode_size);
} else if (emit->pass == MP_PASS_EMIT) {
// Code info and/or bytecode can shrink during this pass.
assert(emit->code_info_offset <= emit->code_info_size);
assert(emit->bytecode_offset <= emit->bytecode_size);
if (emit->code_info_offset != emit->code_info_size
|| emit->bytecode_offset != emit->bytecode_size) {
// Code info and/or bytecode changed size in this pass, so request the
// compiler to do another pass with these updated sizes.
emit->code_info_size = emit->code_info_offset;
emit->bytecode_size = emit->bytecode_offset;
return false;
}
if (emit->overflow) {
mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("bytecode overflow"));
}
// Bytecode is finalised, assign it to the raw code object.
mp_emit_glue_assign_bytecode(emit->scope->raw_code, emit->code_base,
#if MICROPY_PERSISTENT_CODE_SAVE || MICROPY_DEBUG_PRINTERS
emit->code_info_size + emit->bytecode_size,
#endif
emit->emit_common->children,
#if MICROPY_PERSISTENT_CODE_SAVE
emit->emit_common->ct_cur_child,
#endif
emit->scope->scope_flags);
}
return true;
}
void mp_emit_bc_adjust_stack_size(emit_t *emit, mp_int_t delta) {
if (emit->pass == MP_PASS_SCOPE) {
return;
}
assert((mp_int_t)emit->stack_size + delta >= 0);
emit->stack_size += delta;
if (emit->stack_size > emit->scope->stack_size) {
emit->scope->stack_size = emit->stack_size;
}
}
void mp_emit_bc_set_source_line(emit_t *emit, mp_uint_t source_line) {
#if MICROPY_ENABLE_SOURCE_LINE
if (MP_STATE_VM(mp_optimise_value) >= 3) {
// If we compile with -O3, don't store line numbers.
return;
}
if (source_line > emit->last_source_line) {
mp_uint_t bytes_to_skip = emit->bytecode_offset - emit->last_source_line_offset;
mp_uint_t lines_to_skip = source_line - emit->last_source_line;
emit_write_code_info_bytes_lines(emit, bytes_to_skip, lines_to_skip);
emit->last_source_line_offset = emit->bytecode_offset;
emit->last_source_line = source_line;
}
#else
(void)emit;
(void)source_line;
#endif
}
void mp_emit_bc_label_assign(emit_t *emit, mp_uint_t l) {
// Assigning a label ends any dead-code region, and all following opcodes
// should be emitted (until another unconditional flow control).
emit->suppress = false;
mp_emit_bc_adjust_stack_size(emit, 0);
if (emit->pass == MP_PASS_SCOPE) {
return;
}
// Label offsets can change from one pass to the next, but they must only
// decrease (ie code can only shrink). There will be multiple MP_PASS_EMIT
// stages until the labels no longer change, which is when the code size
// stays constant after a MP_PASS_EMIT.
assert(l < emit->max_num_labels);
assert(emit->pass == MP_PASS_STACK_SIZE || emit->bytecode_offset <= emit->label_offsets[l]);
// Assign label offset.
emit->label_offsets[l] = emit->bytecode_offset;
}
void mp_emit_bc_import(emit_t *emit, qstr qst, int kind) {
MP_STATIC_ASSERT(MP_BC_IMPORT_NAME + MP_EMIT_IMPORT_NAME == MP_BC_IMPORT_NAME);
MP_STATIC_ASSERT(MP_BC_IMPORT_NAME + MP_EMIT_IMPORT_FROM == MP_BC_IMPORT_FROM);
int stack_adj = kind == MP_EMIT_IMPORT_FROM ? 1 : -1;
if (kind == MP_EMIT_IMPORT_STAR) {
emit_write_bytecode_byte(emit, stack_adj, MP_BC_IMPORT_STAR);
} else {
emit_write_bytecode_byte_qstr(emit, stack_adj, MP_BC_IMPORT_NAME + kind, qst);
}
}
void mp_emit_bc_load_const_tok(emit_t *emit, mp_token_kind_t tok) {
MP_STATIC_ASSERT(MP_BC_LOAD_CONST_FALSE + (MP_TOKEN_KW_NONE - MP_TOKEN_KW_FALSE) == MP_BC_LOAD_CONST_NONE);
MP_STATIC_ASSERT(MP_BC_LOAD_CONST_FALSE + (MP_TOKEN_KW_TRUE - MP_TOKEN_KW_FALSE) == MP_BC_LOAD_CONST_TRUE);
if (tok == MP_TOKEN_ELLIPSIS) {
emit_write_bytecode_byte_obj(emit, 1, MP_BC_LOAD_CONST_OBJ, MP_OBJ_FROM_PTR(&mp_const_ellipsis_obj));
} else {
emit_write_bytecode_byte(emit, 1, MP_BC_LOAD_CONST_FALSE + (tok - MP_TOKEN_KW_FALSE));
}
}
void mp_emit_bc_load_const_small_int(emit_t *emit, mp_int_t arg) {
assert(MP_SMALL_INT_FITS(arg));
if (-MP_BC_LOAD_CONST_SMALL_INT_MULTI_EXCESS <= arg
&& arg < MP_BC_LOAD_CONST_SMALL_INT_MULTI_NUM - MP_BC_LOAD_CONST_SMALL_INT_MULTI_EXCESS) {
emit_write_bytecode_byte(emit, 1,
MP_BC_LOAD_CONST_SMALL_INT_MULTI + MP_BC_LOAD_CONST_SMALL_INT_MULTI_EXCESS + arg);
} else {
emit_write_bytecode_byte_int(emit, 1, MP_BC_LOAD_CONST_SMALL_INT, arg);
}
}
void mp_emit_bc_load_const_str(emit_t *emit, qstr qst) {
emit_write_bytecode_byte_qstr(emit, 1, MP_BC_LOAD_CONST_STRING, qst);
}
void mp_emit_bc_load_const_obj(emit_t *emit, mp_obj_t obj) {
emit_write_bytecode_byte_obj(emit, 1, MP_BC_LOAD_CONST_OBJ, obj);
}
void mp_emit_bc_load_null(emit_t *emit) {
emit_write_bytecode_byte(emit, 1, MP_BC_LOAD_NULL);
}
void mp_emit_bc_load_local(emit_t *emit, qstr qst, mp_uint_t local_num, int kind) {
MP_STATIC_ASSERT(MP_BC_LOAD_FAST_N + MP_EMIT_IDOP_LOCAL_FAST == MP_BC_LOAD_FAST_N);
MP_STATIC_ASSERT(MP_BC_LOAD_FAST_N + MP_EMIT_IDOP_LOCAL_DEREF == MP_BC_LOAD_DEREF);
(void)qst;
if (kind == MP_EMIT_IDOP_LOCAL_FAST && local_num <= 15) {
emit_write_bytecode_byte(emit, 1, MP_BC_LOAD_FAST_MULTI + local_num);
} else {
emit_write_bytecode_byte_uint(emit, 1, MP_BC_LOAD_FAST_N + kind, local_num);
}
}
void mp_emit_bc_load_global(emit_t *emit, qstr qst, int kind) {
MP_STATIC_ASSERT(MP_BC_LOAD_NAME + MP_EMIT_IDOP_GLOBAL_NAME == MP_BC_LOAD_NAME);
MP_STATIC_ASSERT(MP_BC_LOAD_NAME + MP_EMIT_IDOP_GLOBAL_GLOBAL == MP_BC_LOAD_GLOBAL);
(void)qst;
emit_write_bytecode_byte_qstr(emit, 1, MP_BC_LOAD_NAME + kind, qst);
}
void mp_emit_bc_load_method(emit_t *emit, qstr qst, bool is_super) {
int stack_adj = 1 - 2 * is_super;
emit_write_bytecode_byte_qstr(emit, stack_adj, is_super ? MP_BC_LOAD_SUPER_METHOD : MP_BC_LOAD_METHOD, qst);
}
void mp_emit_bc_load_build_class(emit_t *emit) {
emit_write_bytecode_byte(emit, 1, MP_BC_LOAD_BUILD_CLASS);
}
void mp_emit_bc_subscr(emit_t *emit, int kind) {
if (kind == MP_EMIT_SUBSCR_LOAD) {
emit_write_bytecode_byte(emit, -1, MP_BC_LOAD_SUBSCR);
} else {
if (kind == MP_EMIT_SUBSCR_DELETE) {
mp_emit_bc_load_null(emit);
mp_emit_bc_rot_three(emit);
}
emit_write_bytecode_byte(emit, -3, MP_BC_STORE_SUBSCR);
}
}
void mp_emit_bc_attr(emit_t *emit, qstr qst, int kind) {
if (kind == MP_EMIT_ATTR_LOAD) {
emit_write_bytecode_byte_qstr(emit, 0, MP_BC_LOAD_ATTR, qst);
} else {
if (kind == MP_EMIT_ATTR_DELETE) {
mp_emit_bc_load_null(emit);
mp_emit_bc_rot_two(emit);
}
emit_write_bytecode_byte_qstr(emit, -2, MP_BC_STORE_ATTR, qst);
}
}
void mp_emit_bc_store_local(emit_t *emit, qstr qst, mp_uint_t local_num, int kind) {
MP_STATIC_ASSERT(MP_BC_STORE_FAST_N + MP_EMIT_IDOP_LOCAL_FAST == MP_BC_STORE_FAST_N);
MP_STATIC_ASSERT(MP_BC_STORE_FAST_N + MP_EMIT_IDOP_LOCAL_DEREF == MP_BC_STORE_DEREF);
(void)qst;
if (kind == MP_EMIT_IDOP_LOCAL_FAST && local_num <= 15) {
emit_write_bytecode_byte(emit, -1, MP_BC_STORE_FAST_MULTI + local_num);
} else {
emit_write_bytecode_byte_uint(emit, -1, MP_BC_STORE_FAST_N + kind, local_num);
}
}
void mp_emit_bc_store_global(emit_t *emit, qstr qst, int kind) {
MP_STATIC_ASSERT(MP_BC_STORE_NAME + MP_EMIT_IDOP_GLOBAL_NAME == MP_BC_STORE_NAME);
MP_STATIC_ASSERT(MP_BC_STORE_NAME + MP_EMIT_IDOP_GLOBAL_GLOBAL == MP_BC_STORE_GLOBAL);
emit_write_bytecode_byte_qstr(emit, -1, MP_BC_STORE_NAME + kind, qst);
}
void mp_emit_bc_delete_local(emit_t *emit, qstr qst, mp_uint_t local_num, int kind) {
MP_STATIC_ASSERT(MP_BC_DELETE_FAST + MP_EMIT_IDOP_LOCAL_FAST == MP_BC_DELETE_FAST);
MP_STATIC_ASSERT(MP_BC_DELETE_FAST + MP_EMIT_IDOP_LOCAL_DEREF == MP_BC_DELETE_DEREF);
(void)qst;
emit_write_bytecode_byte_uint(emit, 0, MP_BC_DELETE_FAST + kind, local_num);
}
void mp_emit_bc_delete_global(emit_t *emit, qstr qst, int kind) {
MP_STATIC_ASSERT(MP_BC_DELETE_NAME + MP_EMIT_IDOP_GLOBAL_NAME == MP_BC_DELETE_NAME);
MP_STATIC_ASSERT(MP_BC_DELETE_NAME + MP_EMIT_IDOP_GLOBAL_GLOBAL == MP_BC_DELETE_GLOBAL);
emit_write_bytecode_byte_qstr(emit, 0, MP_BC_DELETE_NAME + kind, qst);
}
void mp_emit_bc_dup_top(emit_t *emit) {
emit_write_bytecode_byte(emit, 1, MP_BC_DUP_TOP);
}
void mp_emit_bc_dup_top_two(emit_t *emit) {
emit_write_bytecode_byte(emit, 2, MP_BC_DUP_TOP_TWO);
}
void mp_emit_bc_pop_top(emit_t *emit) {
emit_write_bytecode_byte(emit, -1, MP_BC_POP_TOP);
}
void mp_emit_bc_rot_two(emit_t *emit) {
emit_write_bytecode_byte(emit, 0, MP_BC_ROT_TWO);
}
void mp_emit_bc_rot_three(emit_t *emit) {
emit_write_bytecode_byte(emit, 0, MP_BC_ROT_THREE);
}
void mp_emit_bc_jump(emit_t *emit, mp_uint_t label) {
emit_write_bytecode_byte_label(emit, 0, MP_BC_JUMP, label);
emit->suppress = true;
}
void mp_emit_bc_pop_jump_if(emit_t *emit, bool cond, mp_uint_t label) {
if (cond) {
emit_write_bytecode_byte_label(emit, -1, MP_BC_POP_JUMP_IF_TRUE, label);
} else {
emit_write_bytecode_byte_label(emit, -1, MP_BC_POP_JUMP_IF_FALSE, label);
}
}
void mp_emit_bc_jump_if_or_pop(emit_t *emit, bool cond, mp_uint_t label) {
if (cond) {
emit_write_bytecode_byte_label(emit, -1, MP_BC_JUMP_IF_TRUE_OR_POP, label);
} else {
emit_write_bytecode_byte_label(emit, -1, MP_BC_JUMP_IF_FALSE_OR_POP, label);
}
}
void mp_emit_bc_unwind_jump(emit_t *emit, mp_uint_t label, mp_uint_t except_depth) {
if (except_depth == 0) {
if (label & MP_EMIT_BREAK_FROM_FOR) {
// need to pop the iterator if we are breaking out of a for loop
emit_write_bytecode_raw_byte(emit, MP_BC_POP_TOP);
// also pop the iter_buf
for (size_t i = 0; i < MP_OBJ_ITER_BUF_NSLOTS - 1; ++i) {
emit_write_bytecode_raw_byte(emit, MP_BC_POP_TOP);
}
}
emit_write_bytecode_byte_label(emit, 0, MP_BC_JUMP, label & ~MP_EMIT_BREAK_FROM_FOR);
} else {
emit_write_bytecode_byte_label(emit, 0, MP_BC_UNWIND_JUMP, label & ~MP_EMIT_BREAK_FROM_FOR);
emit_write_bytecode_raw_byte(emit, ((label & MP_EMIT_BREAK_FROM_FOR) ? 0x80 : 0) | except_depth);
}
emit->suppress = true;
}
void mp_emit_bc_setup_block(emit_t *emit, mp_uint_t label, int kind) {
MP_STATIC_ASSERT(MP_BC_SETUP_WITH + MP_EMIT_SETUP_BLOCK_WITH == MP_BC_SETUP_WITH);
MP_STATIC_ASSERT(MP_BC_SETUP_WITH + MP_EMIT_SETUP_BLOCK_EXCEPT == MP_BC_SETUP_EXCEPT);
MP_STATIC_ASSERT(MP_BC_SETUP_WITH + MP_EMIT_SETUP_BLOCK_FINALLY == MP_BC_SETUP_FINALLY);
// The SETUP_WITH opcode pops ctx_mgr from the top of the stack
// and then pushes 3 entries: __exit__, ctx_mgr, as_value.
int stack_adj = kind == MP_EMIT_SETUP_BLOCK_WITH ? 2 : 0;
emit_write_bytecode_byte_label(emit, stack_adj, MP_BC_SETUP_WITH + kind, label);
}
void mp_emit_bc_with_cleanup(emit_t *emit, mp_uint_t label) {
mp_emit_bc_load_const_tok(emit, MP_TOKEN_KW_NONE);
mp_emit_bc_label_assign(emit, label);
// The +2 is to ensure we have enough stack space to call the __exit__ method
emit_write_bytecode_byte(emit, 2, MP_BC_WITH_CLEANUP);
// Cancel the +2 above, plus the +2 from mp_emit_bc_setup_block(MP_EMIT_SETUP_BLOCK_WITH)
mp_emit_bc_adjust_stack_size(emit, -4);
}
void mp_emit_bc_end_finally(emit_t *emit) {
emit_write_bytecode_byte(emit, -1, MP_BC_END_FINALLY);
}
void mp_emit_bc_get_iter(emit_t *emit, bool use_stack) {
int stack_adj = use_stack ? MP_OBJ_ITER_BUF_NSLOTS - 1 : 0;
emit_write_bytecode_byte(emit, stack_adj, use_stack ? MP_BC_GET_ITER_STACK : MP_BC_GET_ITER);
}
void mp_emit_bc_for_iter(emit_t *emit, mp_uint_t label) {
emit_write_bytecode_byte_label(emit, 1, MP_BC_FOR_ITER, label);
}
void mp_emit_bc_for_iter_end(emit_t *emit) {
mp_emit_bc_adjust_stack_size(emit, -MP_OBJ_ITER_BUF_NSLOTS);
}
void mp_emit_bc_pop_except_jump(emit_t *emit, mp_uint_t label, bool within_exc_handler) {
(void)within_exc_handler;
emit_write_bytecode_byte_label(emit, 0, MP_BC_POP_EXCEPT_JUMP, label);
emit->suppress = true;
}
void mp_emit_bc_unary_op(emit_t *emit, mp_unary_op_t op) {
emit_write_bytecode_byte(emit, 0, MP_BC_UNARY_OP_MULTI + op);
}
void mp_emit_bc_binary_op(emit_t *emit, mp_binary_op_t op) {
bool invert = false;
if (op == MP_BINARY_OP_NOT_IN) {
invert = true;
op = MP_BINARY_OP_IN;
} else if (op == MP_BINARY_OP_IS_NOT) {
invert = true;
op = MP_BINARY_OP_IS;
}
emit_write_bytecode_byte(emit, -1, MP_BC_BINARY_OP_MULTI + op);
if (invert) {
emit_write_bytecode_byte(emit, 0, MP_BC_UNARY_OP_MULTI + MP_UNARY_OP_NOT);
}
}
void mp_emit_bc_build(emit_t *emit, mp_uint_t n_args, int kind) {
MP_STATIC_ASSERT(MP_BC_BUILD_TUPLE + MP_EMIT_BUILD_TUPLE == MP_BC_BUILD_TUPLE);
MP_STATIC_ASSERT(MP_BC_BUILD_TUPLE + MP_EMIT_BUILD_LIST == MP_BC_BUILD_LIST);
MP_STATIC_ASSERT(MP_BC_BUILD_TUPLE + MP_EMIT_BUILD_MAP == MP_BC_BUILD_MAP);
MP_STATIC_ASSERT(MP_BC_BUILD_TUPLE + MP_EMIT_BUILD_SET == MP_BC_BUILD_SET);
MP_STATIC_ASSERT(MP_BC_BUILD_TUPLE + MP_EMIT_BUILD_SLICE == MP_BC_BUILD_SLICE);
int stack_adj = kind == MP_EMIT_BUILD_MAP ? 1 : 1 - n_args;
emit_write_bytecode_byte_uint(emit, stack_adj, MP_BC_BUILD_TUPLE + kind, n_args);
}
void mp_emit_bc_store_map(emit_t *emit) {
emit_write_bytecode_byte(emit, -2, MP_BC_STORE_MAP);
}
void mp_emit_bc_store_comp(emit_t *emit, scope_kind_t kind, mp_uint_t collection_stack_index) {
int t;
int n;
if (kind == SCOPE_LIST_COMP) {
n = 0;
t = 0;
} else if (!MICROPY_PY_BUILTINS_SET || kind == SCOPE_DICT_COMP) {
n = 1;
t = 1;
} else if (MICROPY_PY_BUILTINS_SET) {
n = 0;
t = 2;
}
// the lower 2 bits of the opcode argument indicate the collection type
emit_write_bytecode_byte_uint(emit, -1 - n, MP_BC_STORE_COMP, ((collection_stack_index + n) << 2) | t);
}
void mp_emit_bc_unpack_sequence(emit_t *emit, mp_uint_t n_args) {
emit_write_bytecode_byte_uint(emit, -1 + n_args, MP_BC_UNPACK_SEQUENCE, n_args);
}
void mp_emit_bc_unpack_ex(emit_t *emit, mp_uint_t n_left, mp_uint_t n_right) {
emit_write_bytecode_byte_uint(emit, -1 + n_left + n_right + 1, MP_BC_UNPACK_EX, n_left | (n_right << 8));
}
void mp_emit_bc_make_function(emit_t *emit, scope_t *scope, mp_uint_t n_pos_defaults, mp_uint_t n_kw_defaults) {
if (n_pos_defaults == 0 && n_kw_defaults == 0) {
emit_write_bytecode_byte_child(emit, 1, MP_BC_MAKE_FUNCTION, scope->raw_code);
} else {
emit_write_bytecode_byte_child(emit, -1, MP_BC_MAKE_FUNCTION_DEFARGS, scope->raw_code);
}
}
void mp_emit_bc_make_closure(emit_t *emit, scope_t *scope, mp_uint_t n_closed_over, mp_uint_t n_pos_defaults, mp_uint_t n_kw_defaults) {
if (n_pos_defaults == 0 && n_kw_defaults == 0) {
int stack_adj = -n_closed_over + 1;
emit_write_bytecode_byte_child(emit, stack_adj, MP_BC_MAKE_CLOSURE, scope->raw_code);
emit_write_bytecode_raw_byte(emit, n_closed_over);
} else {
assert(n_closed_over <= 255);
int stack_adj = -2 - (mp_int_t)n_closed_over + 1;
emit_write_bytecode_byte_child(emit, stack_adj, MP_BC_MAKE_CLOSURE_DEFARGS, scope->raw_code);
emit_write_bytecode_raw_byte(emit, n_closed_over);
}
}
STATIC void emit_bc_call_function_method_helper(emit_t *emit, int stack_adj, mp_uint_t bytecode_base, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
if (star_flags) {
// each positional arg is one object, each kwarg is two objects, the key
// and the value and one extra object for the star args bitmap.
stack_adj -= (int)n_positional + 2 * (int)n_keyword + 1;
emit_write_bytecode_byte_uint(emit, stack_adj, bytecode_base + 1, (n_keyword << 8) | n_positional); // TODO make it 2 separate uints?
} else {
stack_adj -= (int)n_positional + 2 * (int)n_keyword;
emit_write_bytecode_byte_uint(emit, stack_adj, bytecode_base, (n_keyword << 8) | n_positional); // TODO make it 2 separate uints?
}
}
void mp_emit_bc_call_function(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
emit_bc_call_function_method_helper(emit, 0, MP_BC_CALL_FUNCTION, n_positional, n_keyword, star_flags);
}
void mp_emit_bc_call_method(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_keyword, mp_uint_t star_flags) {
emit_bc_call_function_method_helper(emit, -1, MP_BC_CALL_METHOD, n_positional, n_keyword, star_flags);
}
void mp_emit_bc_return_value(emit_t *emit) {
emit_write_bytecode_byte(emit, -1, MP_BC_RETURN_VALUE);
emit->suppress = true;
}
void mp_emit_bc_raise_varargs(emit_t *emit, mp_uint_t n_args) {
MP_STATIC_ASSERT(MP_BC_RAISE_LAST + 1 == MP_BC_RAISE_OBJ);
MP_STATIC_ASSERT(MP_BC_RAISE_LAST + 2 == MP_BC_RAISE_FROM);
assert(n_args <= 2);
emit_write_bytecode_byte(emit, -n_args, MP_BC_RAISE_LAST + n_args);
emit->suppress = true;
}
void mp_emit_bc_yield(emit_t *emit, int kind) {
MP_STATIC_ASSERT(MP_BC_YIELD_VALUE + 1 == MP_BC_YIELD_FROM);
emit_write_bytecode_byte(emit, -kind, MP_BC_YIELD_VALUE + kind);
emit->scope->scope_flags |= MP_SCOPE_FLAG_GENERATOR;
}
void mp_emit_bc_start_except_handler(emit_t *emit) {
mp_emit_bc_adjust_stack_size(emit, 4); // stack adjust for the exception instance, +3 for possible UNWIND_JUMP state
}
void mp_emit_bc_end_except_handler(emit_t *emit) {
mp_emit_bc_adjust_stack_size(emit, -3); // stack adjust
}
#if MICROPY_EMIT_NATIVE
const emit_method_table_t emit_bc_method_table = {
#if MICROPY_DYNAMIC_COMPILER
NULL,
NULL,
#endif
mp_emit_bc_start_pass,
mp_emit_bc_end_pass,
mp_emit_bc_adjust_stack_size,
mp_emit_bc_set_source_line,
{
mp_emit_bc_load_local,
mp_emit_bc_load_global,
},
{
mp_emit_bc_store_local,
mp_emit_bc_store_global,
},
{
mp_emit_bc_delete_local,
mp_emit_bc_delete_global,
},
mp_emit_bc_label_assign,
mp_emit_bc_import,
mp_emit_bc_load_const_tok,
mp_emit_bc_load_const_small_int,
mp_emit_bc_load_const_str,
mp_emit_bc_load_const_obj,
mp_emit_bc_load_null,
mp_emit_bc_load_method,
mp_emit_bc_load_build_class,
mp_emit_bc_subscr,
mp_emit_bc_attr,
mp_emit_bc_dup_top,
mp_emit_bc_dup_top_two,
mp_emit_bc_pop_top,
mp_emit_bc_rot_two,
mp_emit_bc_rot_three,
mp_emit_bc_jump,
mp_emit_bc_pop_jump_if,
mp_emit_bc_jump_if_or_pop,
mp_emit_bc_unwind_jump,
mp_emit_bc_setup_block,
mp_emit_bc_with_cleanup,
mp_emit_bc_end_finally,
mp_emit_bc_get_iter,
mp_emit_bc_for_iter,
mp_emit_bc_for_iter_end,
mp_emit_bc_pop_except_jump,
mp_emit_bc_unary_op,
mp_emit_bc_binary_op,
mp_emit_bc_build,
mp_emit_bc_store_map,
mp_emit_bc_store_comp,
mp_emit_bc_unpack_sequence,
mp_emit_bc_unpack_ex,
mp_emit_bc_make_function,
mp_emit_bc_make_closure,
mp_emit_bc_call_function,
mp_emit_bc_call_method,
mp_emit_bc_return_value,
mp_emit_bc_raise_varargs,
mp_emit_bc_yield,
mp_emit_bc_start_except_handler,
mp_emit_bc_end_except_handler,
};
#else
const mp_emit_method_table_id_ops_t mp_emit_bc_method_table_load_id_ops = {
mp_emit_bc_load_local,
mp_emit_bc_load_global,
};
const mp_emit_method_table_id_ops_t mp_emit_bc_method_table_store_id_ops = {
mp_emit_bc_store_local,
mp_emit_bc_store_global,
};
const mp_emit_method_table_id_ops_t mp_emit_bc_method_table_delete_id_ops = {
mp_emit_bc_delete_local,
mp_emit_bc_delete_global,
};
#endif
#endif // MICROPY_ENABLE_COMPILER
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